<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .box {
      border: 3px solid #000000;
      border-radius: 10px;
      padding: 20px;
      margin: 20px;
      width: 200px;
    }
    h3 {
      margin: 10px 0 20px 0;
    }
    p {
      margin: 20px;
    }
  </style>
</head>
<body>

  <div id="app">
    <div class="box">
      <h3>小黑自动售货机</h3>
      <button @click="buy(5)">可乐5元</button>
      <button @click="buy(10)">咖啡10元</button>
      <button @click="buy(8)">牛奶8元</button>
    </div>
    <p>银行卡余额：{{ money }}元</p>


    <!-- <p v-for="(items,index) in arr">{{items}}--------{{index}}</p> -->

    <ul>
      <li v-for="(items,index) in bookList" :key="index">{{items.name}}--------{{items.author}}--------{{items.price}}
        <button @click="removeBook(index)">删除</button>
      </li>
      <li></li>
    </ul>


    <input type="text" v-model="userName">
    <input type="password" v-model="password">
    <button @click="subMit">登录</button>
  </div>

  <script src="./vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        money: 100,
        arr:[
          'apple',
          'banana',
          'cherry'
        ],
        bookList:[
          {
            name: '三国演义',
            author: '乌鸦',
            price: 9.9
          },
          {
            name: '红楼��',
            author: '������',
            price: 15.8
          },
          {
            name: '西游记',
            author: '��承��',
            price: 12.5
          },
          {
            name: '水��传',
            author: '施����',
            price: 10.5
          }
        ],
        userName: '',
        password: ''
      },
      methods: {
        buy (price) {
          this.money -= price
        },
        removeBook (index) {
          this.bookList.splice(index, 1)
        },
        subMit(){
          if(this.userName != null && this.password != null){
            alert('登陆成功')
          }else{
            alert('登陆失败')
          }
          this.userName = ''
          this.password = ''

          // 重置input框
          this.$refs.userName.value = ''
          this.$refs.password.value = ''
        }
      }
    })
  </script>
</body>
</html>